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Hillcrest balance and motion unit capped off with roller-coaster

Second-grade students at Hillcrest School have been having a great time learning about balance and motion. They balanced pencils with counterweights, used force to get tops to spin, made twirlers and watched air resistance help them spin, and made rollers with cups and disks with shafts. The grand finale was to create a whole class roller coaster and learn how gravity pulls the marble through the course–but only if you start the marble at the right height!

–Photos by Donna Amidon

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